Vibratory screen



March 19, 1940. M. F. WARNER 2,193,954

VIBRATORY SCREEN Filed May l2. 1958 4 Sheets-Sheet 1 @F9 M5 @W6 ImT IWI7 Il 1-11- Il: :l/

March 19, 1940. M WARNER 2,193,954

V'IBRATORY SCREEN Filed May 12. 1958 4 sheets-sheet 2 4" :r I 4 5 im@ 7im? 6 111|'l F. 11 12'( l @um +6 Ml@ March I9, 1940.

M. F. WARNER VIBRATORY scm-:EN

Filed nay 12. 195e 4 sheets-sheet s @Sw amm, Wm fm March 19, 1940. M. F.WARNER 2,193,954

vIBnmronY SCREEN Filed May 12, 1958 4 Shets-Sheet 4 Patented Mar. 19,1940 PATENT OFFICE 2,193,954 vIBRAToRYpscRsE, y

Munroe F. Warner,v Columbus, Ohio,Y assigner tor American Zinc, v,Lead t,Smeltingompany St. Louis, Mo.,l a cprporaton `oirlVlaine ApplicationMay 121, 193s, serial-N0. 207,633 warms; mmoefsis) This inventionrelates to vibrating screens` and 'to the particular means for mountingthesame whereby the vibration of the screen can 'be more eflicientlyeffected and which, when certain classes of material are being screened,can be o p- @ratedv with minimum injury to the structure as a whole.

Existing screens of the vibrating typeare of ytwogeneral designs, in oneof which rthescreen cloth is vstretched and attached rigidly lwithin aframe andthe entire frame vibrated.` I n this .case the mass or weightto `be vibrated is l greater than is desirable and imposes heavy loadsupon the vibrator and bearings, and results in severe reaction on' thefoundations and supports. In the `other type the screen clot-h isstretched .betweensirnple springs for light service, the vibrator beingattached .directly to the vscreen cloth so that the screen cloth itselfis directly vibrated thereby. `In this case Vibration is intense'in themiddle of the screen area, where the vibrating mechanism is attached,and ris toa great degree diminished or even absent at the edges and`ends of theA screensurface.`

lOne of the objects of Athe present invention is to so mount the screencloth 'that vthe entire screen surface shall be free to lvibrate andgatthe Sametime reduce the mass or weight ytombe Viorated. This isaccomplished by `providiizig a devicel or devices which shall be free tomove within required limits in a direction vlnormal to the screensurface during vibration, `which devices yare carried by -iiXed ornon-vibrating -supports. l

The inventive idea is capable of receiving a varietyl oi mechanicalembodiments, vsome o f which for thepurpose of illustratingythe-invenvtion' are shown lin the accompanying drawings,

but it is to be expressly understood -thatsuch drawings are i'or thepurpose of illustration only and are not ,designed to define thelimitsof theinvention, reference ybeing had to `the.il/.ppended claims forthis purpose.

IIn. said drawings- Fig. 1 is a plan view partially broken-.,away,illustrating twov forms of one lembodiment .oi the `invention; ,.J

Fig. 2 is an end elevation of Fig. 1;

50' Fig. 3 is an enlarged sectional `detail-pf the construction shown inFig. 41;

Fig. 4 is a plan View rpartially y,buiken.faraway showing a modicationof the invention;

fFig. .5 `is an end elevation-of Ethe.,Constructlrm shown inFigA; y Y yFig. 6 is an enlarged section in detail of the construction shown inFig. 4;

Fig. 7 is a plan view with parts broken away of lstillanothermodification;

`Fig.'8 is anelevation'of Fig. 7;

Fig. 9 is an enlarged sectional View of the structure shown in Fig. 7;

' Fig. 9a is a detail Asection showing a slight modification of Fig. v9;and

Fig. l0 illustrates a still further modication of Fig. -9. v

y"Referring `to the drawings in which like reference numerals indicatelike parts throughout the severa-1 views, `l-I indicatek stationary sidebars mounted on any suitable supporting structure, not shown, one ofthese bars being placed on eachA side of the screen structure, and 2--2indicate screen anchors preferably right angular in cross section, asshown in'Fig. 3. These screen yanchorsare placed between therespectveside bars, one adjacent to each side vbar'. These screenanchors areeacli yieldingly connected to the rethe screen anchors mayhave a Vibrating move- -ment up and down vwith relation to the side bars`and yin aA plane approximately normal to the spective side barsof thestructure to the end that screen cloth'.v As shown in Fig. 3, the screenani Ycliors"21h'ave abearng block or a plurality of bearing blocks' 2'rigidly connected thereto and extending upward therefrom so'` that theblocks constitute in effect an upward extension of the screen' anchors'.These blocks 2 have formed therein,`on the side adjacent to the sidebars I, a `groove 2, and a secondbearing block or strip v-I-K isr`rigidly secured `to the inner face of the side bar. This bearing -b-locki has formed therein ya groove l" approximately opposite and prei-.erably slightly/below the groove '25 in the bearing block 2f, and a bar3, preferably having rounded edges, vextends* between and takes piv-.,banasshowninthe lleftof Fig. l, `or-the same l.may be ,a y,continuousIbar 3, r`as shown vin the fright ofgFig. yl andextending the fulllength of 4 the screen, ibut in either construction the yield-Otalbearingin the'two grooves l and y2, the f ing action is in a planeapproximately normal to the screen cloth.

On the exterior of each side bar I is mounted a bearing seat 4 (Fig. 3)for a spring 5, the outer end of the spring taking against a follower 6through which follower extends a pin 'l hinged to the bearing block 2 at8 so as to permit the pin I to move in a vertical plane around the pinl. The exterior end of the pin 'I is screw threaded and has a nut 9thereon, whereby the follower is forced inward against the spring toplace the same under compression.

A series of these spring devices is placed along each side of thestructure, and in operation the nuts 9 are tightened until the rods 1are brought to a horizontal position and centered within the springs, atwhich point the screen cloth will be properly tightened and its tensioncounterbalanced by the springs.

The screen cloth I is stretched between the screen anchors 2, preferablywith the edges of the screen cloth turned around and over the horizontalarm of the screen anchors, as shown at le in Fig. 3, but it is to beunderstood that any ecient means for securing the screen cloth to thescreen anchors may be employed.

Now, referring to Figs. 4, 5 and 6, there is therein shown amodification in which the same spring construction 5 illustrated inconnection with Fig. l is also employed, together with the same screenanchors and upwardly extending elements 2. In this structure theyielding connection of the screen anchor to the side bars takes the formof a hingle. A series of upwardly and inwardly inclined bars II (Fig. 6)are pivoted to the upper end of anchor extension 2' by a pin I2 and tothe side bar I by a pin I3 to the end that the screen anchors and withthem the screen cloth may be free to move up and down with relation tothe side bars. 'I'he pins I2 and I3 may extend the entire length of' thescreen as at the right in Fig. 4, or there may be a separate pair ofpins I2 and I3 for each hinge bar as at the left of Fig. 4. As in thecase of the bar construction heretofore described, there may be aplurality of bars II, one located at each of the spring tension devices(see left of Fig. 4) or if desired, there may be a continuous series of'hinge members along the full length of the screen and hinged to the sidebars I and the anchors 2 as at the right of Fig. 4.

Referring now to Figs. 7, 8, 9, 9a and 10, there is shown therein thesame spring device 5 as that described in connection with Figs. 1 to 6,inclusive. In the construction shown in Fig. 9, the screen anchors 2 areyieldingly connected to the side bars I by means of spring bars I5extending from points outside of the side bars and through openingstherein and to a point above the anchor bar Z where each bar I5 isrigidly secured thereto. The exterior end of the spring bar I5 ismounted in a housing I 'I rigidly secured to the exterior of the sidebars, the spring bar being rigidly bolted within the housing as shown.By this construction a yielding connection is aiorded between the anchorbar and the side bar. Such yielding connection is obtained in a modiedform by the construction shown in Fig. 9a in which the spring arm I5 ishinged to the screen anchor 2.

Instead of providing an elastic bar I5, as shown in Fig. 9 and dependingupon the resiliency of the bar itself to respond to the vibrations, arigid bar I5' (Fig. l0) may be employed hinged at its inner end to thescreen anchor 2, with its outer end in the housing I'I, which housing isrigidly secured to the exterior of the side bar I. Resilient material,such as rubber, is mounted in the housing on each side of the rigid barI5', to the end that the end of the bar I5', where it is hinged to thescreen anchor 2, may be permitted to move similar to that of the springbar I5, shown in Fig. 9.

It will be observed that whatever be the form of yielding connectionemployed between the side bars and the screen anchors, the pivotalconnection of the spring tension device is connected to the anchor barsat a point intermediate said yielding connection and the point where thescreen cloth is attached to the screen anchor.

Whatever vform of yielding connection employed between the side bars andscreen anchors may be, any suitable vibration mechanism, such aselectromagnetic vibrators I9, may be employed, and such vibrators may beconnected to the screen at any desired point as at the center 20 (Figs.2 and 5) or at the edges or corners of the screen as at 2| (Figs. 2 and8).

It will be noted that the screen cloth is free to vibrate withoutvibrating the stationary side bars.

Whatever form of yielding connection between the side bars and screenanchors is employed, cover plates 22, 22 are secured to the interiorside of each side bar I and extend down below the top of the screenanchors or extensions thereof.

It will be appreciated that by means of the construction hereindescribed, there is provided means which yieldingly connect each of thescreen anchors to its adjacent side bar, such yielding means taking theform of pivoted bars (Figs. 1 to 3), or other yielding hingeconstructions (Figs. 4 to 6, inclusive), or the yielding barconstruction (Figs. 7 to 10, inclusive), the essential eature being thatwhen the screen is stretched by means of the tension springs 5 and setin vibration by any suitable vibrating mechanism, the screen support, toWit, the screen anchors, are able to move freely and rapidly in an upand down direction so that the entire body of the screen cloth issubjected to practically uniform vibration. Furthermore, it will beobserved thatthe mountings for the screen are not of such mass or weightas to deaden or materially influence the vibrations.

What is claimed is:

l. In a screen device, the combination of a pair o f oppositely disposedstationary side bars, screen anchors between said side bars, oneadjacent each of said bars, said screen anchors each hav- A.

ing an extension member rigidly secured thereto, yielding connectionsbetween said extension members and said side bars and inclined upwardly.and inwardly from the side bars, a screen cloth y 2. In a screendevice, the combination of a pair 'of oppositely disposed side bars,screen anchors between said side bars, one adjacent each of said bars,said screen anchors each having an upwardly extending member rigidlysecured there to, hinge connections between said extension,

members and said side bars and having members inclined vupwardly andinwardly from the side bars, a `screen cloth connected to the screenanchors, spring tension means pivoted to said extension members betweensaid hinge connections and the screen cloth connections, and meansvibrating the screen.

3. In a screen device, the combination ofl a pair of oppositely disposedside bars, screen anchors between said side bars, one adjacent each ofsaid bars, said screen anchors each having an extension memberrigidlysecured thereto, rocking bar connections between said extension membersand said side bars and inclined upwardly and inwardly from theside bars,spring tension means pivoted to said extension members below saidrocking bar connections, a screen cloth secured to and extending betweenthe screen i anchors, and means vibrating the screen,

4. In a screen device, the combination of a pair of oppositely disposedstationary side bars, screen anchors between said side bars, one'adjacent each of said bars, said screen anchors each having an extensionmember rigidly secured thereto, yielding connections between saidextension members and said side bars,l a screen cloth connected to thescreen anchors, spring tension means pivoted to said extension membersbetween said yielding connections and the screen cloth connections tothe screen anchors, and means Vibrating the screen, relative tothe sidebars and in a plane substantially normal to its surface.

5. In a screen device, the combination of a pair of oppositely disposedstationary side bars, screen ancho-rs between said side bars, oneadjacent each of said bars, said screen anchors each having an. upwardlyextending member rigidly secured thereto, hinge connections between saidextension members and said side bars, a screen cloth connected to thescreen anchors, spring ltension means pivoted to said extension membersbetween said hinge connections and the screen cloth connections, andmeans vibrating the screen, relative to the side bars and in a planesubstantially normal to its surface.

6. In a screen device, the combination ofl a pair of oppositely disposedstationary side bars, screen anchors between said side bars, oneadjacent each of said bars, said screen anchors each having an extensionmember rigidly secured thereto, rocking bar connections between saidextension members and said side bars, spring tension means pivoted tosaid extension members below said rocking bar connections, a screencloth secured to and extending between the screen anchors, and meansvibrating the screen, relative to the side bars and in a planesubstantially normal to its surface.

7. In a screen device the combination of oppositely disposed stationaryside bars, a screen cloth, screen cloth anchors adjacent each of. saidside bars, yielding lconnecting bars extending longitudinally of theside bars along a line substantially parallel to said screen clothanchors and forming yielding connections between said side bars andscreen cloth anchors, yielding tension means pivotally connected tosaidscreen cloth anchors between said screen cloth and said connecting barsand reacting against said side bars and putting th-e screen cloth undertension, and means vibrating the screen cloth, relative to the side barsand in a plane substantially normal to its surface.

MUNROE F. WARNER.

